fix: add ELIXIR_ERL_OPTIONS to shell environment to force utf8 locale

flake.nix

@@ -166,6 +166,7 @@
                   );
                 enterShell = ''
                   export LOCALES="${cldr}/priv/cldr";
+                  export ELIXIR_ERL_OPTIONS="+fnu";
                   export PORT="4000"
                   export ENCRYPTION_KEY="your_secure_encryption_key_here"
                   export DATABASE_USER="teslamate"